【題目】-- Who told you the news?
-- I don't remember clearly. It ________ Mary.
-- It Mary. She doesn't know it.
A.may have been; can't be
B.can be; mustn't be
C.must have been; can't have been
D.may have been; may not be

【答案】A
【解析】句意：—誰告訴你的消息？—我記不清了，可能是Mary�！豢赡苁荕ary，她不知道這事。對過去事情的可能的猜測用may/might have+過去分詞；can表猜測時用于否定句和疑問句，must表示肯定的猜測，只用于肯定句。第一空意思是可能是Mary告訴我的這個消息，指對已發(fā)生的事情的猜測，用may have been；第二空表示否定，故用can't，因此選A。

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